Online content subscription dispute

VODACOM Sees itself as a giant that can do whatever it wants with their customers, boiling with "anger" I was shocked today by the balance on my VODACOM Flexi 200 instead of receiving R200 airtime as agreed on the balance was R17.50. As usual you know the long wait you have to do when calling their call center I managed to get hold of an agent - I was very shocked to hear that The airtime was used by a content subscription which I don't know where it came from. Noxolo who was suppose to assist told me that there's nothing she could do because the fault wasn't coming from VODACOM - I had insisted that she unsubscribe me from the content and requested that they refund my airtime but she couldn't give me an answer instead she told me I had subscribed myself into the service. I'm very unhappy with the matter I find myself in hence I never missed a single payment for my account I went so far even porting my other network number to Vodacom. All I need is my airtime back and an explanation how this content ended up using my airtime.